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Interesting... How is it risky?
Because then people who urgently need money do everything to get that money.
E.g. lie in that questionnaire. And you know who needs a lot of money? Intravenous drug users. Who tend to share needles. And have a higher risk of high risk sexual behaviour (both from prostitution itself but also rape, infections in their mucosal areas,etc)
Right... but I was asking about the technical method itself.
I'm pretty sure they'd check your blood before you proceed.
the problem is that blood can be check only so thoroughly - some illnesses only develop much later and can only be tested for then, especially on a large scale. That's why in most countries the first donation is not actually used for anything besides testing.
Anyway, plasmapheresis/apheresis has the risk of a reaction to the sodium citrate that is used as a anticoagulant - there are systems that use no sodium citrate but they increase the risk for embolisms. Sodium citrate can cause hypocalcaemia, seizures,hypertention and a few more things,but generally it's safe in the donor setting.